Miniature power-driven sewing machine



D. A. MERSQN EI'AL MINIATURE'POWER-DRIVEN SEWING MACHINE July 29, 1952 '3 Sheets-Sheet 1 Filed Dec. 12, 1946 Obu ' I'NVENTORS DAVID A. MERSON lslDNEY R. BELL- ATTORNEYS.

D. A. MERSON El" AL MINIATURE POWER-DRIVEN SEWING MACHINE July 29, 1952 5 Sheets-Sheec. 2

Filed Dec. 12, 1946 vv ww m ON vm P LM vw I In I vm mm ow II- IJ vm an n y 3 u 4! I mv 9 8 08 mm om I J Now v ATTORNEYS y 29, 1952 p. A. MERSON ET AL 2,604,862

MINIATURE POWER-DRIVEN SEWING MACHINE Filed Dec. 12, 1946 5 Sheets-Sheet 3 INVENTORS DAVID AME soN SIDNEY R. BELL BY v (2 ATTo RN EYS Patented July 29, 1952 MINIATURE POWER-DRIVEN SEWING? David A. Merson, Great Neck, N. Y.,

and Sidney.

E. Bell, Stamford,'Conn., assignors to Irving 1 J Moritt, Brooklyn, N. Y

Application December 12, 1946, Serial No. 715,860

13 Claims. 1

This invention relates to sewing machines, and more particularly to a miniature lockstitch sewing machine which may, if desired, be held in one hand while being operated.

The primary object of the present invention is to provide a lockstitch sewing machine so small and light that it may be held in onehand while being operated, and so portable that it may be carried in a ladys'luggage during trips. It may be moved to the work instead of movin the work to the machine, where the work is relatively large or for some other reason is not conveniently movable.

Some features of the present invention, such as the work feed mechanism and thread take-up mechanism, are disclosed and claimed in our copending application Serial Number 714,792, filed December 7, 1946. However, in the present case the sewing machine, although tiny and light in weight, is power-driven instead of being driven manually, as in our co-pending application. In accordance with the present invention, the sewing mechanism is provided with a handle which may be held in one hand and by which the entire machine may be supported, and the electric motor for driving the sewing mechanism is housed within the aforesaid handle.

In accordance with another feature of the invention, a motor-controlling switch button is provided which is accessible to a finger of the hand holding the aforesaid handle, so that the machine may be operated in short runs by momentary pressure on the button.

Another object of the invention is to provide smoothly running cam and cam follower mechanism driven by the aforesaid motor for driving both the needle and the shuttle in properly timed relation.

Still another object of the invention is to provide power-driven winding mechanism for winding thread on a bobbin. As will later appear, this is done by using the main spool support for thi additional purpose.

To accomplish the foregoing general objects, and other more specific objects which will hereinafter appear, our invention resides in the miniature lockstitchv sewing machine elements and, their relation one to the other, as are hereinafter more particularly described in the fol lowing specification. The specification is accompanied by drawings, in which:

Fig. 1 is a partially sectioned elevation of a sewing machine embodying features of our invention;

Fig. 2 is a horizontal section taken approximately in the plane of the line 2-2 OfFig. 1-; Fig. 3 is avertical section taken approxi mately inthe plane of the line 3-3 of Fig.2;

. Fig. 4 is a horizontal section taken approximately in the plane oftheline 44 of Fig.3; Fig. 5 is a plan view of the shuttle with the bobbin positioned therein; i Fig. 6 is a partially sectioned end elevation of the sewing machine; I

Fig. 7 is a fragmentary view similar to Fig,6, but showing the work feed dog in retracted position;

Fig. 3 is a vertical section taken approximately in the plane of the line 88 of Fig. 1;

Fig. 9 is a section through a part of the control switch for the motor, said section being taken approximately in the plane of the line 9-9 of Fig. 8; and

Fig. 10 is a time diagram showing the action of the cams employed in the mechanism. Referring to the drawings, and more particuelarly to Fig.1, the miniature hand-holdable lockstitch sewing machine there shown is very small, the body of the machine exclusive of the handle being less than five inches in length, and the entire machine including the handle or motor housing, being less than eight inches long.., The machine comprises a needle I2 receiving a first thread M, a shuttle I6 having a bobbin'l8 for supplying a second thread, and a handle 20 which houses an electric motor for drivingthe machine. There'is' a threadtake-up mechanism, part of which is shown at '22 in Fig. 1, and all of which is shown in Fig. "3. There is also work feed mechanism including a work feed dog 24 (Fig. l). The switch button 26 is accessible to a finger of the hand holding the handlelzfl. This switch button controls the operation of the motor, either by pressure for short runs, or by sliding movement for long runs. Power is supplied to the motor through a conventional flexible cord 28 having a female connector 30 detachably pluggedinto the end ofthe handle, as is better shown in Fig. 3. I g j The machine has a relatively flat bottom and therefore maybe rested on a table for support, insteadof being held by the hand which oper ates the machine. If desired, it may. even be clamped on a tablea s by, means of a removable clamp (not shown) generally resembling a 0- clamp, but having a top arm which is of dovetail section and adapted to be slidablyreceived in a mating dovetail slot 32 in the bottom {of the machine.

thetmachine (see Fig. 44-) Pini'on: 50* meshes with a Needle bar drive port 42 extending diametrically across the outer portion 44 of the motor housing, this being separate casting which is fitted to the handle portion of the main housing 40, the parts being held in assembled relation by tie-rods 46- which have threaded ends screwed into housing 40. The armature 48 with armature windings 50 connected to commutator 52 are all carried on the motor shaft 34 in conventional fashion. The laminated. ferrous metal for the field is fitted into thc casing 20 with a force fit-aridthefield' windings 54' are added in the aguar' mamer. The brushes for'en'gagmg the do 't'ator are 'preferahly carbon brushes of rectangular cross-section received in appropriate"'g'uides disp'osed diametrically on "opposite "sidesof the "commutator, the brushes being urged inwardly by small" helical compression springs held in place by screws, one of which is shown at 55 in Fig. i i-The motor may be conventional, and it is therefore believed that a mors detaileddescri'ption is unnecessary for the present purpose.

" jThfe 'construction or the switch 26 is illustratedin-Figs;;8' and -9fof the drawings. Referring thereto; it will be seen that the inner end I40 hf-button 2'6" bears against a movable contact I-"lZ diSpoSed collaterally of'a stationary contact I44. A bifurcated spring M6 is provided for mechanicalireasons, this being received in slots on opposite-"sidesof button The spring M6 *lields th'e button 26 against escape, and also urgesthe-button outward to the position shown -in*Fig.':8, so' that the switch contacts are normally open; However, pressure on. button 26 moves senate [42' against contactlfl', thus closing the circuit and energizing-the motor. If desiredpthe switch may be kept closed, this being doiie'bysliding the button downwardly, in which case? theisloping end I "of the button acts as'a time inst the movable contact I42. Howe'irer, in most cases the? button is used for momentary contact; the machine beingoperated onlyso long as the-button is pressed? fl'Reverting to Fig.3, the forward end of the motor shaft 34 carriesa pinion. 56 which meshes iwithiasgear 58 secured tov a bevel pinion 60,

whichinturn is carried onastud 62 secured to afbaring'i pedestal 64 screwed to the base 66 of bevel gear ID fasterred; by means of screws to the lower end of a. cylindrical cam 12. This is rotatable on a shaft the lower end of which isreceived in 16 in the base'66, and'the upper end a bearing of which is received in a bearing 18 in the housiiiaABLTf 1".T1ie, needle '12 is carried at the forward end of a'needlebartll, the rear. or base end of which isLenlarged' to form' a cross-head 82 which is vertically "reciprocable on guides or ways 84.

"The, ways (Fig 2) are secured to the cast 'liousing byfmeansof screws 86, and are prefer- ..a'blymade of O'ilite or equivalent self-lubri- Eating bearing metal. A cam follower roller 88 projects from the inside of cross-head 82, and

4 is received in a cam track in cylindrical cam 12. It will be evident that the cross-head, needle bar and needle are reciprocated vertically as the cylindrical cam is rotated by the motor.

The shape of the cam track is such as to move the needle to lowermost position, to then raise the needle slightly to form a loop of thread, to then dwell briefly to afford timefor' the shuttle to engage said loop, and to then raise the needle. The timing of the particular machine here illustrated is shown in Fig. 10, in which the curve surface of the cylindrical cam. It will be seen that the needle is lowered in about rotatationofthe cam; raised about an eighth of inch during the next 35; dwells for approximately 90; and is raised to initial position in the next 90. There is'a short dwell in top position.

The shuttle drive Referring to Fig; 1, the shuttle it rests on a shuttle. carrierwhich is connected to and'rotated by a'pinion 92. Referring now to Fig; 4,, it will be seen that pinion 92 .mesheswith a .rack'lld which is guided in a trackQG; The rear end ofrack 94 is prcvidedwith a cam follower roller 98 received in a cam'groove Hi0; Referring now to'Fig. 3, the cam groove. It!!! may be formed in the 'bottomface of the bevel gear 1-0 previously referred to. .It will thus be evident that the shuttle isoscillated as the cylindrical cam is rotated; The cam shape is developed in: Fig. 10, and is shown as curve B. The descending portion of curve B. corresponds to return movement of the shuttle, while the ascending'portion; corresponds to forward movement of the shuttle, such that the hook of: the shuttle engages the loop' or thread. formed by the needle when it rises slightly from lowermost position. 'Ihe'needl'e dwells: from about to 2.60 and during this dwell period the shuttle catches the lo'opand draws it around itself.

The shuttle is shown in somewhat greater. detail in Fig. 5, but probably requires no detailed description because it may be and preferablyis conventional- It. includes .a hook 102 which engages the loop formed by partial upward movement of the needle as previously described, theneedle working in a needle hole shown at M14. The shuttle is oscillated approximately 250, this being accomplished by the pinion andrack mechanism previously described.

The bobbin is best shown at 3 (Fig. 5), and it will be understood that the bottom thread comes from the bobbin 18 past a' spring 'tensioning device in the shuttle, then through a hole in the shuttle, and finally through the regular needle hole located directly above the hole HM, said needle hole being formed in a needle plate which is slidably removable from above the shuttle when the bobbin is to be re-wound. The needle plate is shown in position at I06 inFig. 1, but is assumed removed in Fig. 5.

The shuttle l6 rests loosely on a-shuttle carrier insuch a manner that a loop of the upper thread may be passed entirely around the shuttle when the hook I 02 engages the'loop and turns another 180. As the-shuttle turns still further past dead center, the loop escapes from the open sideof the hook on the opposite side of the shuttle. This interengages the'upper and lower threads. The large slack loop is then tightened both by the thread take-up mechanism, and by raising-of the needle itself. The shuttle turns back (clockwise in Fig. 5) to initial position preparatory to making: the next stitch, and since in the meantime-the 5 cloth beingjsewn is fed a short distance bythe work feed dog, the next stitch will in each case be spaced from the previous stitch. T

i The thread takeup Referring to Fig. 3 of the drawings, the upper thread istaken from a spool H and is run through an eye H2 and a'thread'tensioning device I I4, this being of conventional type employing two discs held together by a spring the tensioning of which may be adjusted by means of a knob H6. From the thread tensioning device the thread'is run through an eye I I8 to a hole at the end I26 of the thread take-up arm 22. The thread is then led down to an eye I22 and thence tothe eye of the needle Iii, the thread being 'passedfrom the outside toward the inside of the needle, as is better shown in Fig. 1.

The thread take-up arm 22 is operated by direct connection to the needle bar 69. Specifically, the arm 22 is pivoted at I 24. A link I 26 is connected to the cross-head of the needle bar 86 at I28, and is connected to the arm 22 at I30. Actually, a pair of links I26 may be used, one on each side of the arm 22, as is best shown in Fig. 6, but for purposes of description, they maybe considered a single link. There is a lost-motion connection between the needle bar 86 and the arm 22, this being provided by slotting the endof link I 26,: as is'shown at I32. This lost-motion connection is provided because the preferred timing of the takeup arm 22 is not the same as that of the needle bar 86. With the lost-motion connection, the operation is less critical in timing because thereis a period of maximum slack when the thread takeup arm is in lowermost position, instead of. only an instant of maximum'slack. This lowermost position of the take-up arm is shown'in'broken lines at 22 (Fig. 3) and corresponds to lowering of the needle bar'86 tothe broken-line position 86. The maximum slack is maintained over atime period corresponding generally to the time when the shuttle draws the loop of thread diametrically around itself. Thereafter the thread take-up begins to tighten the loop to small size.

Work feed mechanism The work feed mechanism is best shown in Figs. 2, 6 and '1. Referring thereto, the work is fed by a. serrated feed dog 24 which is bifurcated to straddlethe needle. The feed dog is oscillated about a pivot I52 by a rod I54 which extends vertically upwardly to the needle bar 86. In Fig. 6, the needle bar is shown in elevated position, it

moving against a collar I56 on the upperend of rod'I54, thereby pulling the rod upwardly and so moving the feed dog 24 in work feeding direction. This takes place while the needle I2 is raised, so that the work is freed for forward feed movement. In Fig. 7, the needle bar 80 is shown sequently the length of the stitch, may be controlled by a bushing I66 threadedly'receivedin an ear I62 projecting sidewardly from the needle bar 80. When the bushing is screwed upwardly, the stitch is lengthened, and when the bushing is screwed downwardly, the stitch is shortened.

referred to. The Y m'otjon and thus thread may be taken from the spool andfeddirectlyto the bobbin until the The work feed mechanism preferably includes means torelieve the' pressure of the feed dog on the work' during its'returnmovement. For this purpose, the pivot I52 (Fig. 2) of 'the feed dog is preferably carried on a dog-supporting rocker arm I64 pivoted at'l66 on a bracket I68 which carries the entire feed mechanism." Rocker I64 is permitted a slight up and down movement, this being limited by appropriatemeans which in the presentcase consists of an inturned' end I10 which bears against thero utside of bracket" I68 when the'rocker is elevated slightly," as shown in Fig? 7-. The lower endof rod I54 is connected to a'dog operating lever I12 (Fig.2) pivoted directly on bracket I 66 at I14; In Fig. 2 it will be' s'een that although the pivot I52 of the feed dog is substantially in alignment with the pivot I14 of lever I12, 'they are not a common pin,the pivot I14 being immovable onbracket I68, and theLpin I52 being free to rise or fallwith the rocker I64; Lever I12 rigidly carries a pin I16 which engages a slot I18 in the end of the feed dog.

' Referring to Fig. 6, downward movement of pin I16 tends to move the rocker I64 and the feed dog'24 downward, and after engagement of the work, so that the dog can no longer move downwardly, it is necessarily turned about its pivot I52. Referring; next to Fig. 7, upward movement ,of the pin I16 tends to move the rocker I64 upwardly, thus elevating the feed dog 24 from-the workuntil the rocker can no longer rise,;-;its motion being; limited by. the stop I16. Thereafter the feed dog is necessarily swung about its pivot I52. If desired, a smallleaf spring I86, best shown in Figs. 1. and ZZ may be providedto normally urge the rocker I64 downwardly, therebyassuringa ias in favorof tight frictional feed of the fabric being sewn.

Theentirefeed mechanismso far described is carried on bracket I66, which is itself bodily movable upwardly. This movement isdesirable when starting a new piece of work in the machine, or when removing work from the machine, or when threading the needle.- The base endof bracket I68 forms across-headl82 (Figs..2. and 6), which is slidable on a, dovetail sectioned guide I34. A small'handleor finger-piece I86 may be provided to raise or lower bracket I 68, and in Figs. 1 and 2 it will beseen that this finger-piece is pivoted at I88, and is connected to a pin I90 projecting from the cross-head I82. Pin I90 is received in a slot inthe finger-piece, and it will be evident that by raising or swinging the fingerpiece in clockwise direction, as seen in Fig. 1,- the bracket I68 and with it the entire feed mechanism is bodily raised. This upward motion is permitted by the slidable relation of rod I54 in bushing I60.

' The finger-piece may-be designed to lock the bracket in down position, but this is not-essential because of the overhung nature of the bracket, for any upward pressure at the end locks the cross-headon the guide.

j The" bobbin winder fluted, and thereby adapted to 'frictiona'llyreceive the bobbin I8 of theshuttlelfi previously rod I34 may be rotated by the bobbin has been wound. The spool, of course, is loose on support rod I94, and is not afiected by the rotation of the rod: i

" Referring to "Figblyit will-be seen' that the :Refer'ringnotr to Fig. .3 of thei drawings, it'will be seenJ-that: rod I94 is: rotatable-in abearing I95: and is held against axial movement by a collar 1:98 abovenbearing 196, and a head or wheel 200 below bearing I96. A lever 202 is oscillatable about the bushing 1,96 and rod [94 (see Fig. 2) previously referred to. It is normally urged in clockwise direction .to the inoperative position shown in Fig.2, by. a leaf spring 204. The end 206 of leverv 292 is serrated and projects through a slot208in the .hcusing wall. Lever 202 carries an idlerwheel 2"! which bears against the enlarged head20fl at the bottomof spool support rod, 194. By pressing the serrated end 206 of lever-202 in counter-clockwisedirection. the intermediate or idler wheel 2I0 is pressed against the periphery of the cylindrical cam 12 at its upperend. The spool support rod is then rotated by the motor, which is convenient for winding the bobbin. At other times, the intermediate or idler wheel 2H3 is disengaged from the cylindrical cam, and the spool support rod remains stationary. It will be understood that the intermediate wheel 2H1 is preferably made of rubber or fibre or equivalent frictional material.

Operation When first setting up the machine, some of the thread from the spool H is wound on the bobbin [8, the bobbin at this time being placed at the top end I92 of the rod I94, the motor button 25 being depressed, and the lever 202 being shifted by means of its serrated end 206. The wound bobbin is then placed in the shuttle, and the thread is appropriately threaded from the bobbin, in conventional fashion, ending upwardly through the needle hole in the needle plate. The upper thread is taken from the spool and threaded as previously described. The work feed mechanism is elevated, the workinserted in the machine, and the feed mechanism lowered, following which the motor control button 26 is pressed until the line of stitching has been carried as far as desired.

The detailed operation of the machine will probably be evident from the description already given, the needle coming down to lowermost position and thus bring the upper thread through the work, the needle then rising a little to form a loop beneath the work, whereupon the shuttle oscillates, its hook catchingthe loop and expanding the loop around itself. The necessary thread is provided by lowering of the thread take-up arm. When the loop is carried more than halfway around the shuttle, it slides from the open end of the hook around the opposite side of the shuttle, and raising of the needleand thread takeup draws the loop tight, it having meanwhile been interlocked with the bobbin thread of the shuttle. The shuttle turns back to initial position. After the needle has leftthe work and near the top of its upward stroke, the feed dog moves the fabric ahead, so that when the needle again descends it enters a newpoint on the fabric.

If a small amount of sewing is to be performed, the machine may be held in one hand or rested loosely on a table. If a great amount of sewing is to be performed, the machine may be clamped near the edge of a table by means of an appropriate C-clamp having a dovetail top. If a little stitching must be done on a largebody of fabric hanging in place, or which for any reason it would be inconvenient to move to the sewing machine, the machine may be carried to the work and there operated.

It is believed that the construction and operation of our improved miniature, power-operated, hand-holdable sewingmachine will be apparent from the foregoing detailed description thereof. It will also be apparent that while we have shown and described our invention in a preferred form, changes may be made in the structure disclosed, without departing from the spirit of the invention as sought to be defined in the following claims.

We claim:

1. A miniature lockstitcli sewing machine comprising a sewing machine body, a driving motor for the sewing machine, a needle bar and a vertical needle receiving an upper thread and arranged for vertical movement, a shuttle having a bobbin for supplying a second thread to be interlocked with the first thread, a vertical cam shaft housed in the body of said machine, reduction gearing connecting the driving motor to said cam shaft, the upper part of said shaft having ,a cam for vertically reciprocating the needle, the lower end of said shaft having a radial cam, apinion on the aforesaid shuttle, a gear rack meshing with said pinion, and a cam follower on said gear rack engaging the aforesaid radial cam for reciprocating said gear rack.

2. A miniature lockstitch sewing machine comprising a sewing machine body, a driving motor for the sewing machine, a needle bar and a vertical needle receiving an upper thread and arranged for vertical movement, a shuttle having a bobbin for supplying a second thread to be interlocked with the first thread, a vertical cam shaft housed in the body of said machine and reduction gearing connecting the driving motor to said cam shaft, the upper part of said shaft having a cylindrical cam with a helical type cam groove for vertically reciprocating the needle, the lower end of said shaft having a face cam with a radial cam groove, a pinion on the aforesaid shuttle for oscillating the same, a gear rack meshing with said pinion and slidable longitudinally of the machine, and a cam follower on said gear rack engaging the aforesaid radial cam groove for reciprocating said gear rack.

3. 7i miniature light-weight hand-holdable lockstitch sewing machine mechanism, said mechanism including a needle receiving a first thread, a shuttle having a bobbin for supplying a second thread, a handle projecting from said mechanism, an electric driving motor for said mechanism housed in said handle, means driven by said motor for reciprocating the needle through the work and toward and from the shuttle, and means driven by said motor for oscillating the shuttle to inter-'- lockthe threads, said means including a vertical cam shaft in the body of the machine, reduction gearing connecting said motor to said shaft, a radial cam at the lower end of the shaft near the bottom of the machine, a gear on the shuttle, a rack meshing with said gear, and a cam follower engaging said cam for reciprocating said rack.

4. A miniature light-weight hand-holdable lockstitch sewing machine mechanism, said mechanism including a needle receiving a first thread, thread take-up means for said first thread, a shuttle having a bobbin for supplying a second thread, a work feed dog, a handle projecting from said mechanism, an electric driving motor for said mechanism housed in said handle, means driven by said motor for reciprocating the needle through the work and toward and from the shuttle, means driven by said motor to operate the feed dogto cause a relative movement of the machine and the work being sewn, and means driven by said motor for oscillating the shuttle to interlock the threadslfsaid means. including a aneedlere'civing'a first thread, a shuttle having a bob'bin'ff'or supplying a'second thread, a handle projecting'ffom' said mechanism, an electric driv' in'g motor'for' said mechanism housed in'said handle,'means,driven by said motor for oscillate ing theshuttle'. to interlock the threads, a nor-' niallyhorizontal overhung needle bar extending longitudinally of the machine and replacing the arm of a conventional sewing machine, the aforesaid needle being carried in a normally vertical position at the free endof said needle bar,'stationary guides r 'ways"slidably receiving the fppositeendo f said horizontal needle bar for vertical movement; and cam andv cam follower-mech anism'drivenby said eleotricjmotor for vertically reciprocating the needle bar and thereby reciprocating theneedle through; the worl; and toward andfrom the 'shuttle. H

6. A miniature light-weight lockstitch sewing machinejmech'anism', said mechanism including a needle receivinga first thread, thread take-up means for said first thread, a shuttle having a bobbin for supplying a second thread, a work feed do'gpa handle projecting from said mechanism, an electric driving motor for said mechanism housed in said handle means driven by said motor for oscillating the shuttle to interlock the threads, means driven by said. motor to operate the feed dog to cause a relative movement of the machine and the work b eingfsewn, a normally horizontal'overhung needle'bar extending longitudinallyof the machine and replacing the arm of a conventional sewing machine, the aforesaid needleibeing carried in'a" normally vertical position'at'the free end'of said needle bar, stationary guides or ways slidably receiving the opposite end of said horizontal needle bar for vertical movement, a cam follower carried by said needle bar, and a cylindrical cam driven by said electric motor for vertically reciprocating the cam follower and needle bar, and thereby reciprocating the needle through the work and toward and from the shuttle.

'7. A lockstitch sewing machine mechanism utilizing a spool of first thread and a bobbin for a second thread, and including a needle receiving the first thread, thread take-up means for said first thread, a shuttle having the aforesaid bobbin for supplying the second thread, a work feed dog, and an electric driving motor for driving said mechanism, a vertical spool-retaining shaft for loosely receiving a main spool of thread, said shaft being longer than the usual spool and having an upwardly extending free end projecting beyond the spool, the said free end of said shaft being fluted to frictionally receive the bobbin, bearing means rotatably mounting the shaft, and means for operatively connecting the driving motor and the spool-retaining shaft when it is desired to wind thread on the bobbin.

8. A miniature light-weight lockstitch sewing machine mechanism, said mechanism including a needle receiving a first thread, a shuttle having a bobbin for supplying a second thread, a handle projecting from said mechanism, an electric drivmeans for said first threadQashuttIe hav' a loosely receiving a 10 ing motor for said mechanismv housed insaid handle,v means driven by said motor for recip'rtg eating the needle .throughlthefwork needle receiving "a first hreadfthread ita'ke up bobbin for supplying a second thread; a work i doe ndl r je ro saidm chanisni; an electric driving motor ,for said "mechanism house'd 'in said handle," means driven; lo said motor for reciprocating theneedle throughf the worlg'and toward and from the shuttlefmeans driven by, said motor, for oscillating thesh'uttle to interlock the threadsjand means drive said motor to operate the feed fdogjto caus relative movement of the machine and" the were; being sewn a vertical spool-retainingshaf J I a main spoolfof'rth adfs aid haf in lo er han th iisu nbol an h ving an upwardly extendingfre'e end projecting beyond" the spool, "the free upper end of said shaft 'b'eing 'fiuted to frictionally receive .the bob-f a f n me s e a ly 'm u t nei h sha t. a. ri i nl'wheel,imq a ou e r o' eratively; connecti g the driving mot r; the spocl retaining ,s'haft when it'is'desired wind thread on the bobbin. 7 V 14110. A miniaturelight-weightlockstitch sewing machine .mechanism, said mechanism including a ed eire' eivi a. fi st t a a hu lehfavin l for supply a egqa i a iiahand e a bobbin projecting from said mechanismj'anelectric driv' ing motor for said mechanism housed in said handle, a motor-controlling switch button accessible to a finger of a hand holding the aforesaid handle, means driven by said motor for reciprocating the needle through the work and toward and from the shuttle, and means driven by said motor for oscillating the shuttle to interlock the threads, a spool-retaining shaft for loosely receiving a main spool of thread, said shaft being longer than the usual spool and having an upwardly extending free end projecting beyond the spool, said free end of said shaft being arranged to frictionally detachably receive the bobbin, bearing means rotatably mounting the shaft, and optionally usable means for operatively connecting the driving motor and the spool-retaining shaft when it is desired to wind thread on the bobbin.

11. A miniature light-weight lockstitch sewing machine mechanism, said mechanism including a needle receiving a first thread, a shuttle having a bobbin for supplying a second thread, a handle projecting from said mechanism, an electric driving motor for said mechanism housed in said handle, a normally horizontal overhung needle bar extending longitudinally of the machine and replacing the arm of a conventional sewing machine, the foresaid needle being carried in a normally vertical position at the free end of said needle bar, stationary guides or ways slldably estates receiving the opposite or rear end of said horizontal needle bar for vertical movement, the body of saidlmachine'having a'vertical cam shaft, andreductionv gearing for connecting the motor to,said'jshaft',,the,upper part of said shaft having ascam-"for vertically reciprocating the needle bar and'theiieby reciprocating the needle. through the workand toward and from the shuttle, the lower part of said shaft-having a radial cam, a gear on the aforesaid shuttle, a rack meshing with the gear; and a cam follower engaging said radial cam. for reciprocating. said rack longitudinally of the machine and thereby oscillating the shuttle to interlock the threads. 7

12. A miniature light-weight lockstitch sewing machines mechanism,. said mechanism including aneedle receiving a first thread, thread take-up m ans; for said first thread, a shuttle having a liohhin. for, supplying a second thread, a work feedfdog, a handleprcjecting from said. mechanism, an. electric driving motor for said mechanism housed in said handle, means driven by said motor to operate the feed 'dogflto cause a relative movement of the machine and the work being .sewn, a. normally horizontal overhung needle bar extending longitudinally of the machine and replacing the arm of a conventional same machine, the aforesaid needle being carri'edlinla normally vertical position at the free end ofisaid needle. bar, stationary guides or ways slidably'receiving the opposite or rear end of said horizontal needle bar for vertical movement, the body ofsaid machine having a vertical cam shaft, and. reduction gearing for connecting the motor tofsaidshaft, the upper part of said shaft havin a cam for vertically reciprocating the needle bar and thereby reciprocating the needle through the work and'toward and from the'shuttle, the lower part of said shaft having a radial cam, a gear on the, aforesaid shuttle, a rack meshing'with the gear',.and a cam follower engaging said radial cam for reciprocatingsaid rack longitudinally of the. machine. and thereby oscillating the shuttle to'interlockthe threads.

, a 1'2 1 .s 13'. A miniature light-welghtilockstitchsewin machine mechanism, saidmechanism including' 'a needle receiving a first thread, a'shuttle having a bobbin for supplying a second thread, ahandle projecting from said mechanism, an electric driving motor for. said mechanism housed in said handle, a motor-controlling'switch button accessible to a finger of a hand holding theaforesaid handle, a normally horizontal overhung needle bar extending longitudinally of'the machine and replacing the arm of a conventional sewingm'achine, the aforesaid needle being carried in a normally vertical position at'the free end of said needle bar, stationary guides or ways slldabl'y' receiving the opposite or rear end of said horizontal needle bar for vertical movement; the body of said'machine having a vertical cam shaft, and reduction gearing for connecting the motor to saidshaft, the upper part of'said shaft having a cam for vertically reciprocating the needl'e'bar and thereby reciprocating the needle through the work and toward and from the shuttle, the-lower part of, said shaft having a radial cam, a'gearon the aforesaid shuttle, a rack meshing with the gear, anda cam follower engaging said radial camior reciprocating saidrack longitudinally'of the machine and thereby oscillatingthe shuttle to interlock the threads.

. DAVIDA. MERSON;

SIDNEY R'. BELL.

REFERENCES CITED The following references are of record in the file of this patent:

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